JP2000306434A - Overhead transmission cable - Google Patents
Overhead transmission cableInfo
- Publication number
- JP2000306434A JP2000306434A JP11112313A JP11231399A JP2000306434A JP 2000306434 A JP2000306434 A JP 2000306434A JP 11112313 A JP11112313 A JP 11112313A JP 11231399 A JP11231399 A JP 11231399A JP 2000306434 A JP2000306434 A JP 2000306434A
- Authority
- JP
- Japan
- Prior art keywords
- forming
- overhead transmission
- peripheral surface
- transmission line
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、架空送電線に係
り、特に、風音およびコロナ騒音が小さい架空送電線に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead power transmission line, and more particularly to an overhead power transmission line with low wind noise and corona noise.
【0002】[0002]
【従来の技術】従来、架空送電線としては、図9に示す
ように、Znメッキ等で防食を施した1本又は複数本の
鋼線91からなる鋼心92の外周に、アルミ素線93を
撚り合わせたACSR(鋼心アルミ撚線)94が主に使
用されてきた。通常、アルミ素線93としては、製造が
容易であるということから、横断面丸型のものが使用さ
れている。2. Description of the Related Art Conventionally, as an overhead transmission line, as shown in FIG. 9, an aluminum wire 93 is provided around the outer periphery of a steel core 92 comprising one or a plurality of steel wires 91 which have been protected by Zn plating or the like. (Australia steel strand stranded wire) 94 which has been mainly used. Usually, as the aluminum strand 93, one having a round cross section is used because it is easy to manufacture.
【0003】しかし、ACSR94からなる架空送電線
に風が当たった場合、風切り音(いわゆる風音)が発生
する。この風音が送電線路通過地域の住民に対して不快
感を与え、騒音問題となる場合がある。このため、平野
部(住宅地、農地)等を通過する架空送電線において
は、風音の低減対策が必要となり、電線表面に高段差突
起部を形成した低風音電線が用いられている。[0003] However, when wind hits the overhead transmission line composed of the ACSR 94, wind noise (so-called wind noise) is generated. This wind noise may cause discomfort to the residents in the transmission line passage area, and may cause a noise problem. For this reason, it is necessary to reduce wind noise in overhead transmission lines passing through plains (residential areas, agricultural lands) and the like, and low wind noise electric wires having high step projections on the surface of the electric wires are used.
【0004】また、降雨時においては、電線の低段差平
滑部表面に水滴が付着し、この水滴に起因してコロナ騒
音(Audible Noise )が発生する。近年になって、架空
送電線の送電電圧は、500kV〜1000kVという
具合に、超高電圧化または極超高電圧化が進んでおり、
電線表面の電位傾度(Gmax)が高くなってきている
ため、コロナ騒音の低減対策も併せて必要になってきて
いる。[0004] Further, during rainfall, water droplets adhere to the surface of the low-level uneven portion of the electric wire, and corona noise (Audible Noise) is generated due to the water droplets. In recent years, the transmission voltage of the overhead transmission line has been increasing to an ultra-high voltage or an ultra-high voltage, such as 500 kV to 1000 kV,
Since the potential gradient (Gmax) on the electric wire surface is increasing, measures for reducing corona noise are also required.
【0005】風音を抑えるためには、図10に示すよう
に、外径D3 の電線101の表面に高段差突起部102
を形成することが効果的であることが知られている。高
段差突起部102と低段差平滑部103との段差h2 お
よび高段差突起部102の開き角には有効範囲があり、
本発明者等の研究によれば、通常用いられている架空送
電線101において、段差h2 は2〜4mm、開き角θ
は20〜60°が望ましい。また、風音の低減効果を更
に高めるためには、低段差平滑部103を形成するアル
ミ素線(図示せず)間に形成される窪み(図示せず)の
深さができるだけ浅く、電線表面の凹凸が少ないことが
望ましい。In order to suppress wind noise, as shown in FIG. 10, a high step projection 102 is formed on the surface of an electric wire 101 having an outer diameter D 3.
Is known to be effective. The opening angle of the level difference h 2 and the high step protrusion 102 of the high-stepped protrusion 102 and the lower stepped flat portion 103 has a valid range,
According to the study of the present inventors, in the overhead transmission line 101 which is usually used, the step h 2 is 2 to 4 mm, and the opening angle θ
Is preferably 20 to 60 °. Further, in order to further enhance the wind noise reduction effect, the depth of the depression (not shown) formed between the aluminum wires (not shown) forming the low step smoothing portion 103 is as small as possible, and the electric wire surface It is desirable that there are few irregularities.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、風音の
低減効果を更に高めるべく、電線表面の凹凸を少なくす
ると、降雨時、水滴が低段差平滑部103に滞留し易く
なり、電線の「水切れ性」が悪化してしまう。その結
果、風音特性の向上を重視し過ぎると、コロナ特性が悪
化してしまうという問題が発生する。However, if the unevenness of the surface of the electric wire is reduced to further enhance the effect of reducing the wind noise, the water droplets can easily stay in the low-level uneven portion 103 during rainfall, and the "water drainage property" of the electric wire is reduced. Is worse. As a result, there is a problem that if the improvement of the wind noise characteristics is emphasized too much, the corona characteristics are deteriorated.
【0007】このため、低段差平滑部103に滞留する
水滴に起因するコロナ騒音を抑えるべく、低段差平滑部
103表面の窪みの深さを意識的に大きくして電線の
「水切れ性」の向上も図った低騒音電線が提案されてい
る。For this reason, in order to suppress corona noise caused by water droplets staying in the low step smoothing portion 103, the depth of the depression on the surface of the low step smoothing portion 103 is intentionally increased to improve the "water drainage" of the electric wire. A low-noise electric wire has been proposed.
【0008】しかし、降雪地域(特に多降雪地域)にお
ける架空送電線においては、風音特性およびコロナ特性
が良好な電線であると共に、表面に雪が着きにくい(難
着雪特性が良好な)電線でなくてはならないが、窪みの
深さが深いということは、横断面形状が図9に示したA
CSR94に近くなり、雪を窪みで捕捉し易いことか
ら、難着雪特性が良好な電線とは程遠くなってしまう。However, an overhead transmission line in a snowfall area (particularly in a heavy snowfall area) is an electric wire having good wind noise characteristics and corona characteristics, and is also a wire on which snow hardly adheres to the surface (has good snow-resistant characteristics). Although it is essential, the fact that the depth of the depression is large means that the cross-sectional shape is A shown in FIG.
Since it is close to CSR94 and it is easy to catch snow in the dents, it is far from an electric wire having good snow-resistant characteristics.
【0009】そこで本発明は、上記課題を解決し、風音
特性およびコロナ特性が実用上十分であると共に、電線
表面に雪が着きにくい架空送電線を提供することにあ
る。It is an object of the present invention to provide an overhead power transmission line which solves the above-mentioned problems, has practically sufficient wind noise characteristics and corona characteristics, and hardly causes snow on the electric wire surface.
【0010】[0010]
【課題を解決するための手段】上記課題を解決するため
に請求項1の発明は、アルミ線と鋼線を撚り合わせると
共に、最外層素線の一部に高さの異なる成形素線を撚り
合わせ、表面に突起となる高段差突起部と低段差平滑部
を形成した架空送電線において、架空送電線最外層の低
段差平滑部を形成する各成形素線間に形成された窪みの
深さHおよび開口幅tが、0.7mm≦H<1.5m
m、t/H≧3、かつ、t>3.0mmを満足するもの
である。Means for Solving the Problems In order to solve the above-mentioned problems, the invention of claim 1 comprises twisting an aluminum wire and a steel wire, and twisting formed wires having different heights on a part of the outermost wire. In addition, in an overhead transmission line in which a high step projection portion and a low step smooth portion which are projections are formed on the surface, the depth of a dent formed between the formed wires forming the low step smooth portion of the outermost layer of the overhead transmission line. H and opening width t are 0.7 mm ≦ H <1.5 m
m, t / H ≧ 3, and t> 3.0 mm.
【0011】以上の構成によれば、風音特性およびコロ
ナ特性を良好に維持したまま、電線表面に雪が着きにく
い架空送電線を得ることが可能となる。According to the above configuration, it is possible to obtain an overhead transmission line in which snow does not easily reach the surface of the electric wire while maintaining good wind noise characteristics and corona characteristics.
【0012】請求項2の発明は、上記低段差平滑部を形
成する成形素線の断面を、実質的に外周面を形成する平
滑な外端面と、内周面となる内端面と、隣り合う成形素
線と密着するように電線半径方向に一致した直線状部を
有する両側端面とで形成し、その両側端面の直線状部と
上記内端面とを結ぶ内周面側の角および両側端面の直線
状部と上記外端面とを結ぶ外周面側の角を直線状又は曲
線状に形成し、隣接する外周面側の角とで窪みを形成す
る請求項1記載の架空送電線である。According to a second aspect of the present invention, the cross-section of the forming wire forming the low-level-smooth portion is substantially adjacent to the smooth outer end surface forming the outer peripheral surface and the inner end surface forming the inner peripheral surface. It is formed with both side end surfaces having straight portions that are aligned in the radial direction of the electric wire so as to be in close contact with the formed wire, and the inner peripheral surface side corners connecting both the straight portions on both side end surfaces and the inner end surface and the two side end surfaces are formed. 2. The overhead transmission line according to claim 1, wherein a corner on the outer peripheral surface side connecting the linear portion and the outer end surface is formed in a straight line or a curved line, and a recess is formed with the corner on the adjacent outer peripheral surface side.
【0013】請求項3の発明は、上記低段差平滑部を形
成する成形素線の断面を、実質的に外周面を形成する平
滑な外端面と、内周面となる内端面と、隣り合う成形素
線と密着するように電線半径方向に一致した直線状部を
有する両側端面とで形成し、その両側端面の直線状部と
上記内端面とを結ぶ内周面側の角を直線状又は曲線状に
形成し、両側端面の直線状部と上記外端面とを結ぶ外周
面側の角を直線状に形成すると共に、その角の直線部の
両端を曲線状に形成し、隣接する外周面側の角とで窪み
を形成する請求項1記載の架空送電線である。According to a third aspect of the present invention, the cross-section of the forming wire forming the low step smooth portion is substantially adjacent to the smooth outer end surface forming the outer peripheral surface and the inner end surface forming the inner peripheral surface. It is formed with both side end surfaces having a linear portion that is aligned in the radial direction of the electric wire so as to be in close contact with the formed wire, and the inner peripheral surface side connecting the linear portion of the both side end surfaces and the inner end surface is linear or It is formed in a curved shape, and a corner on the outer peripheral surface side connecting the linear portion on both side end surfaces and the outer end surface is formed in a linear shape, and both ends of the linear portion of the angle are formed in a curved shape, and the adjacent outer peripheral surface is formed. 2. The overhead transmission line according to claim 1, wherein a depression is formed with the corner on the side.
【0014】[0014]
【発明の実施の形態】以下、本発明の好適一実施の形態
を添付図面に基いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
【0015】本発明の架空送電線の横断面図を図1に、
図1における窪み12の拡大図を図2に示す。FIG. 1 is a cross sectional view of the overhead transmission line of the present invention.
FIG. 2 shows an enlarged view of the depression 12 in FIG.
【0016】図1に示すように、本発明の架空送電線
は、Znメッキ等で防食を施した1本又は複数本(図1
中では7本)の鋼線2からなる鋼心3の外周に、断面略
扇形の成形アルミ素線4からなる撚線層を複層(図1中
では2層)に亘って形成し、その撚線層の外周(最外
層)に、断面略扇形で、断面形状および高さの異なる3
種類の成形アルミ素線(成形素線)5,6,7を撚り合
わせ、表面の少なくとも一部(図1中では上下方向の対
角位置)に高段差突起部8を形成し、かつ、表面残部に
低段差平滑部10を形成したものである。As shown in FIG. 1, one or a plurality of overhead transmission lines of the present invention are provided with corrosion protection by Zn plating or the like (FIG. 1).
On the outer periphery of a steel core 3 composed of seven (7) steel wires 2, a stranded wire layer composed of a molded aluminum element wire 4 having a substantially fan-shaped cross section is formed in multiple layers (two layers in FIG. 1). On the outer periphery (outermost layer) of the stranded wire layer, a section having a substantially fan-shaped cross section and different cross-sectional shapes and
Formed aluminum strands (molded strands) 5, 6, and 7 are twisted to form a high step projection 8 on at least a part of the surface (a diagonal position in the vertical direction in FIG. 1), and The low level difference smoothing part 10 is formed in the remaining part.
【0017】低段差平滑部10は、複数本(図1中では
12本)の成形アルミ素線5を撚り合わせて形成されて
おり、各成形アルミ素線5間には、図2に示すように、
深さHおよび開口幅tの窪み12が形成されている。こ
こで、窪み12の深さHおよび開口幅tは、0.7mm
≦H<1.5mm、t/H≧3、かつ、t>3.0mm
を満足するものである。The low step smoothing portion 10 is formed by twisting a plurality of (12 in FIG. 1) formed aluminum wires 5, and between the formed aluminum wires 5 as shown in FIG. To
A depression 12 having a depth H and an opening width t is formed. Here, the depth H and the opening width t of the depression 12 are 0.7 mm.
≦ H <1.5 mm, t / H ≧ 3, and t> 3.0 mm
Is satisfied.
【0018】成形アルミ素線5の断面は、実質的に外周
面(低段差平滑部10)を形成する平滑な外端面26
と、内周面となる内端面(図示せず)と、隣り合う成形
アルミ素線5と密着するように電線半径方向に一致した
直線状部を有する両側端面27とで形成されており、そ
の両側端面27の直線状部と外端面26とを結ぶ外周面
側の角28aを直線状に形成すると共に、両側端面27
の直線状部と内端面とを結ぶ内周面側の角(図示せず)
を直線状(又は曲線状)に形成し、成形アルミ素線5の
外周面側の角28aと、角28aに隣接する外周面側の
角28bとで窪み12を形成するものである。The cross section of the formed aluminum wire 5 has a smooth outer end surface 26 which substantially forms the outer peripheral surface (low step smooth portion 10).
And an inner end surface (not shown) serving as an inner peripheral surface, and both end surfaces 27 having linear portions that are aligned in the radial direction of the electric wire so as to be in close contact with the adjacent molded aluminum wires 5. A corner 28a on the outer peripheral surface side connecting the linear portion of both side end surfaces 27 and the outer end surface 26 is formed linearly, and both side end surfaces 27 are formed.
Corner (not shown) on the inner peripheral surface side connecting the linear portion of the
Are formed in a straight line (or a curved line), and the recess 12 is formed by a corner 28a on the outer peripheral surface side of the formed aluminum element wire 5 and a corner 28b on the outer peripheral surface side adjacent to the corner 28a.
【0019】高段差突起部8は、成形アルミ素線5より
も高さが高い2本の成形アルミ素線6a,6bと、素線
6a,6bよりも高さが低く、かつ、素線6a,6b間
に挟まれた1本の成形アルミ素線7とで構成され、その
中央部には、素線6a,6bと素線7との高さの差によ
って生じる凹部9が形成されるている。また、高段差突
起部8の開き角はθとなっている。The high step projection portion 8 has two molded aluminum wires 6a and 6b which are higher than the molded aluminum wires 5 and a height which is lower than the wires 6a and 6b and which is smaller than the wires 6a. , 6b, and a concave portion 9 is formed at the center thereof due to a difference in height between the wires 6a, 6b and the wire 7. I have. The opening angle of the high step projection 8 is θ.
【0020】高段差突起部8の架空送電線1の外径をD
1 、低段差平滑部10の架空送電線1の外径をD2 とし
た場合、高段差突起部8と低段差平滑部10との段差h
1 は(D1 −D2 )/2で定義される。The outer diameter of the overhead transmission line 1 of the high step projection 8 is D
1, if the outer diameter of the overhead line 1 of the low stepped smooth portion 10 and a D 2, step h between the high step projections 8 and the low stepped flat portion 10
1 is defined as (D 1 -D 2 ) / 2.
【0021】尚、撚線層を形成するアルミ素線として、
本発明においては各層共断面略扇形の成形アルミ素線4
を用いているが、特に限定するものではなく、断面丸型
のアルミ素線を用いてもよく、また、成形アルミ素線4
と断面丸型のアルミ素線とを組み合わせて撚線層を形成
するようにしてもよいことは言うまでもない。Incidentally, as the aluminum strand forming the stranded wire layer,
In the present invention, each of the layers is a substantially aluminum-shaped formed aluminum wire 4 having a cross section.
However, there is no particular limitation, and a round aluminum wire may be used.
Needless to say, the stranded wire layer may be formed by combining the aluminum wire with a round aluminum element wire.
【0022】次に、本発明の作用を説明する。Next, the operation of the present invention will be described.
【0023】高段差突起部の開き角θ(deg)と風音
レベルの低減量(dB)との関係を図5に示す。FIG. 5 shows the relationship between the opening angle θ (deg) of the high step projection and the reduction amount (dB) of the wind noise level.
【0024】低段差平滑部の外径D2 は同一で、高段差
突起部と低段差平滑部との段差h1が異なる(1.0m
m、1.5mm、2.0mm、2.5mm、3.0m
m、3.5mm、4.0mm)7種類の架空送電線につ
いて、高段差突起部の開き角θを0〜180(deg)
と変化させ、段差h1 および開き角θが風音レベルに及
ぼす影響を調べた結果、図5に示すように、段差h1 が
2.5〜4.0mmの範囲において、良好な風音低減効
果が得られるが、段差h1 があまり高いとコロナ特性を
悪化させるため、2.5mm程度が望ましい。また、開
き角θは20〜60°の範囲において、良好な風音低減
効果が得られた。The outer diameter D 2 of the low step smooth portion is the same, and the step h 1 between the high step protrusion and the low step smooth portion is different (1.0 m).
m, 1.5mm, 2.0mm, 2.5mm, 3.0m
m, 3.5 mm, 4.0 mm) For 7 types of overhead transmission lines, the opening angle θ of the high step projection is 0 to 180 (deg).
Varied and, as a result of step h 1 and opening angle θ was examined the influence on wind noise level, as shown in FIG. 5, step h 1 is in the range of 2.5-4.0, good wind noise reduction the effect is obtained, since the level difference h 1 exacerbates too high a corona characteristics, is preferably about 2.5 mm. When the opening angle θ was in the range of 20 to 60 °, a good wind noise reduction effect was obtained.
【0025】架空送電線表面の電位傾度(Gmax(k
V/cm))とコロナハム音相対レベル(dB(A))
との関係を図6に示す。尚、図中の○印を結んだ線はA
タイプの架空送電線を示し、黒丸印を結んだ線はBタイ
プの架空送電線を示し、△印を結んだ線はCタイプの架
空送電線を示し、▲印を結んだ線はDタイプの架空送電
線を示している。The potential gradient on the surface of the overhead transmission line (Gmax (k
V / cm)) and corona hum sound relative level (dB (A))
Is shown in FIG. The line connecting the circles in the figure is A
The line connecting the black circles indicates the type B overhead transmission line, the line connecting the triangles indicates the type C overhead transmission line, and the line connecting the symbols ▲ indicates the type D overhead transmission line. 2 shows an overhead transmission line.
【0026】低段差平滑部の外径D2 は同一で、平滑な
高段差突起部と低段差平滑部との段差h1 が異なる
(2.7mm、2.3mm)2種類の架空送電線(Aタ
イプおよびCタイプ)と、Aタイプ、Cタイプの各架空
送電線の各高段差突起部の中央に凹部を形成した2種類
の架空送電線(BタイプおよびDタイプ)について、高
段差突起部の形状がコロナハム音レベルに及ぼす影響を
調べた結果、図6に示すように、Gmaxが16.5
(kV/cm)以下の場合において、高段差突起部に凹
部を形成したBタイプおよびDタイプの方が良好なコロ
ナハム音低減効果が得られており、特に、Gmaxが1
5(kV/cm)以下において、その効果が著しい。The outer diameter D 2 of the low step smooth portion is the same, and the step h 1 between the smooth high step protrusion and the low step smooth portion is different (2.7 mm, 2.3 mm). Two types of overhead transmission lines (B type and D type) having a recess formed in the center of each high level projection of each of the A type and C type overhead transmission lines and the A type and C type overhead transmission lines As a result of examining the influence of the shape of the sound on the corona hum sound level, as shown in FIG. 6, Gmax was 16.5.
In the case of (kV / cm) or less, the B type and the D type in which the concave portion is formed in the high step projection portion have a better corona hum noise reduction effect, and in particular, the Gmax is 1
At 5 (kV / cm) or less, the effect is remarkable.
【0027】図5および図6の結果から、中央に凹部9
が形成された高段差突起部8と低段差平滑部10との段
差h1 が2.5mm程度、高段差突起部8の開き角θが
20〜60°を満足する高段差突起部8とすることで、
良好な風音特性およびコロナ特性を備えた架空送電線1
を得ることができる。From the results shown in FIG. 5 and FIG.
To There is formed a high-stepped protrusion 8 step h 1 between the low-stepped flat portion 10 is 2.5mm approximately, a high step protrusion 8 the opening angle θ satisfies 20 to 60 ° high stepped protrusion 8 By that
Overhead transmission line 1 with good wind noise and corona characteristics
Can be obtained.
【0028】低段差平滑部における各成形アルミ素線間
に形成された窪みの深さ(mm)とコロナハム音相対レ
ベル(dB(A))との関係を図7に示す。尚、図中の
○印を結んだ線はGmaxが14(kV/cm)の場合
を示し、×印を結んだ線はGmaxが15(kV/c
m)の場合を示している。FIG. 7 shows the relationship between the depth (mm) of the dent formed between the formed aluminum wires in the low step smooth portion and the corona hum sound relative level (dB (A)). In the drawing, the line connecting the circles indicates the case where Gmax is 14 (kV / cm), and the line connecting the crosses indicates the case where Gmax is 15 (kV / c).
m).
【0029】低段差平滑部10の架空送電線1の外径D
2 は同一のまま、各成形アルミ素線5間の窪み12の深
さHを、0.3mm、0.5mm、0.7mm、1.0
mm、1.5mm、2.0mmと変化させ、窪み12の
深さHがコロナハム音レベルに及ぼす影響を調べた結
果、図7に示すように、Gmax=14およびGmax
=15のどちらにおいても、窪み12の深さHが0.7
mm以上で良好なコロナハム音低減効果が得られた。Outer diameter D of overhead power transmission line 1 of low step smoothing section 10
2 while keeping the same, the depth H of the depression 12 between the formed aluminum wires 5 was set to 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm.
mm, 1.5 mm, and 2.0 mm, and the effect of the depth H of the depression 12 on the corona hum sound level was examined. As shown in FIG. 7, Gmax = 14 and Gmax
= 15, the depth H of the depression 12 is 0.7
mm, a good corona hum sound reduction effect was obtained.
【0030】窪みの開口幅tと深さHとの比(t/H)
と、傾斜角度(度)との関係を図8に示す。尚、図中の
○印を結んだ線はHが0.5mmの場合を示し、×印を
結んだ線はHが1.0mmの場合を示し、△印を結んだ
線はHが1.5mmの場合を示し、□印を結んだ線はH
が2.0mmの場合を示している。Ratio between the opening width t of the depression and the depth H (t / H)
FIG. 8 shows the relationship between the angle and the inclination angle (degree). In the drawings, the line connecting the marks indicates the case where H is 0.5 mm, the line connecting the marks indicates the case where H is 1.0 mm, and the line connecting the marks indicates that H is 1.0 mm. 5 mm is shown, and the line connecting the squares is H
Is 2.0 mm.
【0031】平板に深さH、開口幅tの窪みを形成する
と共に、その窪みに雪を着雪させた後、その平板の傾斜
角度を徐々に大きくしてゆき、何度で雪が落下するか落
下開始角度を調べた結果、図8に示すように、窪みの深
さHが浅いほど落下開始角度は小さくなり、特に、深さ
Hが1.5mmより小さい場合において、雪が落下し易
いという結果が得られた。また、t/Hが大きくなるほ
ど落下開始角度は小さくなり、特にt/Hが3以上の場
合において、雪が落下し易いという結果が得られた。開
口幅tの範囲については、前述した0.7mm≦H<
1.5mm、t/H≧3から求めるとt>2.1mmと
なるが、現実には、tの数値が小さいと、コロナ特性お
よび難着雪特性の両方の効果の達成が技術的に難しいた
め、これらの両方の効果の達成が容易なt>3.0mm
が有効範囲となり、好ましいtの範囲は3.5mm以上
となる。After a depression having a depth H and an opening width t is formed in a flat plate, and snow is deposited in the depression, the inclination angle of the flat plate is gradually increased to determine how many times the snow falls. As a result of examining the fall start angle, as shown in FIG. 8, as the depth H of the depression becomes smaller, the fall start angle becomes smaller. In particular, when the depth H is smaller than 1.5 mm, the result that the snow easily falls. was gotten. Also, as t / H increases, the fall start angle decreases, and in particular, when t / H is 3 or more, the result is that snow easily falls. Regarding the range of the opening width t, the aforementioned 0.7 mm ≦ H <
If 1.5 mm and t / H ≧ 3, t> 2.1 mm, but in reality, if the numerical value of t is small, it is technically difficult to achieve both the corona characteristic and the snow-resistant characteristic. Therefore, t> 3.0 mm where both of these effects can be easily achieved.
Is an effective range, and a preferable range of t is 3.5 mm or more.
【0032】図7および図8の結果から、深さHおよび
開口幅tが、0.7mm≦H<1.5mm、t/H≧
3、かつ、t>3.0mmを満足する窪み12を低段差
平滑部10の各アルミ素線5間に形成することで、良好
なコロナ特性および難着雪特性を備えた架空送電線1を
得ることができる。From the results of FIGS. 7 and 8, the depth H and the opening width t are 0.7 mm ≦ H <1.5 mm and t / H ≧
3, and by forming a dent 12 satisfying t> 3.0 mm between the aluminum wires 5 of the low step smoothing portion 10, the overhead transmission line 1 having good corona characteristics and snow-resistant characteristics is obtained. Obtainable.
【0033】すなわち、本発明によれば、高段差突起部
8の形状、高段差突起部8と低段差平滑部10との段差
h1 、高段差突起部8の開き角θ、低段差平滑部10に
おける各成形アルミ素線5間に形成された窪み12の深
さH、開口幅t、および開口幅tと深さHとの比(t/
H)を所定の範囲に設定しているため、良好な風音特性
およびコロナ特性を維持したまま、表面に雪が着きにく
い架空送電線1を得ることができる。That is, according to the present invention, the shape of the high step projection 8, the step h 1 between the high step projection 8 and the low step smoothing section 10, the opening angle θ of the high step projection 8 and the low step smoothing section 10, the depth H of the depression 12 formed between the formed aluminum wires 5, the opening width t, and the ratio of the opening width t to the depth H (t /
Since H) is set in a predetermined range, it is possible to obtain the overhead power transmission line 1 in which snow does not easily reach the surface while maintaining good wind noise characteristics and corona characteristics.
【0034】また、表面に雪が着きにくい架空送電線1
であるため、多降雪地域に架空したとしても、架空送電
線1に着雪が成長するということはなく、鉄塔強度およ
び電線強度上の信頼性が非常に高くなる。An overhead power transmission line 1 on which snow does not easily reach the surface
Therefore, even if the overhead transmission line 1 is erected in a heavy snowfall area, snow does not grow on the overhead transmission line 1, and the reliability of the tower and the strength of the electric wire is extremely increased.
【0035】次に、本発明の他の実施の形態を添付図面
に基いて説明する。Next, another embodiment of the present invention will be described with reference to the accompanying drawings.
【0036】第1の実施の形態の架空送電線の横断面図
における窪み32の拡大図を図3に示す。FIG. 3 shows an enlarged view of the depression 32 in the cross section of the overhead transmission line according to the first embodiment.
【0037】本発明の架空送電線における窪み12を形
成する成形アルミ素線5の外周面側の角28a,28b
は、直線的に形成されたものであった。In the overhead transmission line of the present invention, corners 28a, 28b on the outer peripheral surface side of the formed aluminum wire 5 forming the depression 12
Was formed linearly.
【0038】これに対して、第1の実施の形態の架空送
電線31の低段差平滑部30における窪み32を形成す
る成形アルミ素線35の断面は、図3に示すように、実
質的に外周面(低段差平滑部30)を形成する平滑な外
端面36と、内周面となる内端面(図示せず)と、隣り
合う成形アルミ素線35と密着するように電線半径方向
に一致した直線状部を有する両側端面37とで形成され
ており、その両側端面37の直線状部と外端面36とを
結ぶ外周面側の角38aを曲線状に形成すると共に、両
側端面37の直線状部と内端面とを結ぶ内周面側の角
(図示せず)を直線状(又は曲線状)に形成し、ある成
形アルミ素線35の外周面側の角38aと、角38aに
隣接する外周面側の角38bとで窪み32を形成するも
のである。On the other hand, as shown in FIG. 3, the cross section of the formed aluminum wire 35 forming the recess 32 in the low step smoothing portion 30 of the overhead transmission line 31 of the first embodiment is substantially as shown in FIG. A smooth outer end surface 36 forming an outer peripheral surface (low step smoothing portion 30), an inner end surface (not shown) serving as an inner peripheral surface, and a radial direction of the electric wire so as to be in close contact with an adjacent molded aluminum wire 35. Of the outer peripheral surface 36 connecting the linear portion of the both side end surfaces 37 and the outer end surface 36 in a curved shape. A corner (not shown) on the inner peripheral surface side connecting the shape portion and the inner end surface is formed in a straight line (or a curved line), and is adjacent to the corner 38a on the outer peripheral surface side of the formed aluminum wire 35 and the corner 38a. The depression 32 is formed with the corner 38b on the outer peripheral surface side.
【0039】第2の実施の形態の架空送電線の横断面図
における窪み42の拡大図を図4に示す。FIG. 4 shows an enlarged view of the depression 42 in the cross section of the overhead transmission line according to the second embodiment.
【0040】第2の実施の形態の架空送電線41の低段
差平滑部40における窪み42を形成する成形アルミ素
線45の断面は、図4に示すように、実質的に外周面
(低段差平滑部40)を形成する平滑な外端面46と、
内周面となる内端面(図示せず)と、隣り合う成形アル
ミ素線45と密着するように電線半径方向に一致した直
線状部を有する両側端面47とで形成されており、その
両側端面47の直線状部と外端面46とを結ぶ外周面側
の角48aを直線状に形成すると共に、その角48aの
直線部49の両端を曲線状に形成し、両側端面47の直
線状部と内端面とを結ぶ内周面側の角(図示せず)を直
線状(又は曲線状)に形成し、ある成形アルミ素線45
の外周面側の角48aと、角48aに隣接する外周面側
の角48bとで窪み42を形成するものである。As shown in FIG. 4, the cross section of the formed aluminum wire 45 forming the depression 42 in the low step smoothing portion 40 of the overhead transmission line 41 of the second embodiment is substantially the outer peripheral surface (low step). A smooth outer end surface 46 forming a smooth portion 40);
An inner end surface (not shown) serving as an inner peripheral surface, and both end surfaces 47 having straight portions which are aligned in the radial direction of the electric wire so as to be in close contact with the adjacent formed aluminum wires 45 are formed. A corner 48a on the outer peripheral surface side connecting the linear portion of the end portion 47 and the outer end surface 46 is formed linearly, and both ends of a linear portion 49 of the corner 48a are formed in a curved shape. A corner (not shown) on the inner peripheral surface side connecting to the inner end surface is formed in a straight line (or a curved line), and a certain formed aluminum wire 45 is formed.
The recesses 42 are formed by the corners 48a on the outer peripheral surface side and the corners 48b on the outer peripheral surface side adjacent to the corner 48a.
【0041】ここで、直線部49の内端面側の一端は所
定の曲率半径の曲線状部51となっていると共に、直線
部49の外端面46側の一端は曲線状部51の曲率半径
よりも大きな曲率半径の曲線状部50となっている。Here, one end of the straight portion 49 on the inner end surface side is a curved portion 51 having a predetermined radius of curvature, and one end of the straight portion 49 on the outer end surface 46 side is smaller than the radius of curvature of the curved portion 51. Also has a curved portion 50 having a large radius of curvature.
【0042】尚、第1の実施の形態および第2の実施の
形態の架空送電線においても、本発明の架空送電線と同
様の効果が得られることは言うまでもない。It is needless to say that the same effects as those of the overhead transmission line of the present invention can be obtained also in the overhead transmission lines of the first and second embodiments.
【0043】[0043]
【実施例】高段差突起部8の外径D1 が38.8mm、
低段差平滑部10の外径D2 が34.2mm、中央に凹
部が形成された高段差突起部8と低段差平滑部10との
段差h1 が2.3mm、高段差突起部8の開き角θが3
6°、低段差平滑部10における各成形アルミ素線5間
に形成された窪み12の深さHが0.9mm、開口幅t
が4.5mm、t/Hが5である架空送電線1を形成
し、風音特性、コロナ特性、および難着雪特性を評価し
た結果、風音レベルおよびコロナ騒音レベルが実用上十
分な程度であると共に、電線表面に対して雪は着きにく
いという結果が得られた。EXAMPLES outer diameter D 1 of the high-stepped protrusion 8 is 38.8 mm,
Open step h 1 between the high step projections 8 and the low stepped flat portion 10 of the outer diameter D 2 is 34.2 mm, the recess formed at the center of the low stepped smooth portion 10 is 2.3 mm, the high-stepped protrusion 8 Angle θ is 3
6 °, the depth H of the depression 12 formed between the formed aluminum wires 5 in the low step smoothing portion 10 is 0.9 mm, and the opening width t is
Was formed and the t / H was 5, an evaluation was made of wind noise characteristics, corona characteristics, and difficult snow deposition characteristics. As a result, the wind noise level and corona noise level were practically sufficient. In addition, the result that it was difficult for snow to reach the electric wire surface was obtained.
【0044】[0044]
【発明の効果】以上要するに本発明によれば、高段差突
起部の形状、高段差突起部と低段差平滑部との段差、高
段差突起部の開き角、低段差平滑部における各成形アル
ミ素線間に形成された窪みの深さ、窪みの開口幅、およ
び開口幅と深さとの比を適宜設定することで、良好な風
音特性およびコロナ特性を維持したまま、表面に雪が着
きにくい架空送電線を得ることができるという優れた効
果を発揮する。In summary, according to the present invention, according to the present invention, the shape of the high step protrusion, the step between the high step protrusion and the low step smooth part, the opening angle of the high step protrusion, and each molded aluminum element in the low step smooth part By appropriately setting the depth of the dent formed between the lines, the opening width of the dent, and the ratio of the opening width to the depth, it is possible to maintain good wind noise characteristics and corona characteristics while maintaining the surface of the imaginary snow. An excellent effect that a transmission line can be obtained is exhibited.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の架空送電線1の横断面図である。FIG. 1 is a cross-sectional view of an overhead transmission line 1 according to the present invention.
【図2】図1における窪み12の拡大図である。FIG. 2 is an enlarged view of a depression 12 in FIG.
【図3】第1の実施の形態の架空送電線の横断面図にお
ける窪み32の拡大図である。FIG. 3 is an enlarged view of a depression 32 in a cross-sectional view of the overhead transmission line according to the first embodiment.
【図4】第2の実施の形態の架空送電線の横断面図にお
ける窪み42の拡大図である。FIG. 4 is an enlarged view of a depression 42 in a cross-sectional view of the overhead transmission line according to the second embodiment.
【図5】高段差突起部の開き角と風音レベルの低減量と
の関係を示す図である。FIG. 5 is a diagram illustrating a relationship between an opening angle of a high step protrusion and a reduction amount of a wind noise level.
【図6】架空送電線表面の電位傾度(Gmax)とコロ
ナハム音相対レベルとの関係を示す図である。FIG. 6 is a diagram illustrating a relationship between a potential gradient (Gmax) on the surface of an overhead transmission line and a corona hum sound relative level.
【図7】低段差平滑部における各成形アルミ素線間に形
成された窪みの深さとコロナハム音相対レベルとの関係
を示す図である。FIG. 7 is a diagram showing a relationship between the depth of a depression formed between the formed aluminum wires in the low step smoothing portion and the relative level of the corona hum sound.
【図8】窪みの開口幅と深さとの比(t/H)と、傾斜
角度との関係を示す図である。FIG. 8 is a diagram showing a relationship between a ratio (t / H) between an opening width and a depth of a depression and an inclination angle.
【図9】従来の架空送電線である鋼心アルミ撚線の横断
面図である。FIG. 9 is a cross-sectional view of a steel core aluminum stranded wire as a conventional overhead transmission line.
【図10】従来の低風音電線の横断面図である。FIG. 10 is a cross-sectional view of a conventional low wind noise electric wire.
1 架空送電線 2 鋼線 4,5,6a,6b,7 成形アルミ素線(成形素線) 8 高段差突起部 10 低段差平滑部 12 窪み 26,36,46 外端面 27,37,47 両側端面 28a,28b,38a,38b,48a,48b 外
周面側の角 49 直線部 50,51 曲線状部 t 開口幅 H 深さDESCRIPTION OF SYMBOLS 1 Overhead power transmission line 2 Steel wire 4,5,6a, 6b, 7 Formed aluminum wire (formed wire) 8 High step projection part 10 Low step smooth part 12 Depression 26,36,46 Outer end surface 27,37,47 Both sides End surfaces 28a, 28b, 38a, 38b, 48a, 48b Corners on outer peripheral surface side 49 Linear portion 50, 51 Curved portion t Opening width H Depth
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 京一 茨城県日立市川尻町4丁目10番1号 日立 電線株式会社豊浦工場内 (72)発明者 窪川 弘 茨城県日立市日高町5丁目1番1号 日立 電線株式会社パワーシステム研究所内 (72)発明者 菅 伸明 茨城県日立市川尻町4丁目10番1号 日立 電線株式会社豊浦工場内 Fターム(参考) 5G307 EA03 EA06 EA08 ED01 EE01 EF05 EF06 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kyoichi Suzuki 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Inside the Toyoura Plant, Hitachi Cable Co., Ltd. (72) Inventor Hiroshi Kubokawa 5-chome, Hidaka-cho, Hitachi City, Ibaraki Prefecture No. 1-1 Hitachi Power Cable Co., Ltd. Power System Research Laboratories (72) Inventor Nobuaki Suga 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Hitachi Cable Co., Ltd. Toyoura Plant F-term (reference) EF06
Claims (3)
最外層素線の一部に高さの異なる成形素線を撚り合わ
せ、表面に突起となる高段差突起部と低段差平滑部を形
成した架空送電線において、架空送電線最外層の低段差
平滑部を形成する各成形素線間に形成された窪みの深さ
Hおよび開口幅tが、0.7mm≦H<1.5mm、t
/H≧3、かつ、t>3.0mmを満足することを特徴
とする架空送電線。1. A method of twisting an aluminum wire and a steel wire,
In the case of an overhead transmission line with twisted shaped strands with different heights on a part of the outermost strand and formed on the surface with a high step projection and a low step smooth part, the low step smoothing of the outermost layer of the overhead transmission line The depth H and the opening width t of the dent formed between the forming wires forming the portion are 0.7 mm ≦ H <1.5 mm, t
/ H ≧ 3, and t> 3.0 mm.
断面を、実質的に外周面を形成する平滑な外端面と、内
周面となる内端面と、隣り合う成形素線と密着するよう
に電線半径方向に一致した直線状部を有する両側端面と
で形成し、その両側端面の直線状部と上記内端面とを結
ぶ内周面側の角および両側端面の直線状部と上記外端面
とを結ぶ外周面側の角を直線状又は曲線状に形成し、隣
接する外周面側の角とで窪みを形成する請求項1記載の
架空送電線。2. A cross section of a forming wire forming the low-stepped smooth portion is formed by closely contacting a smooth outer end surface forming an outer circumferential surface, an inner end surface forming an inner circumferential surface, and an adjacent forming wire. The inner peripheral surface side connecting the linear portions of the both end surfaces and the inner end surface and the linear portions of the both end surfaces are formed by forming the linear end portions having the linear portions coincident with each other in the radial direction of the electric wire. 2. The overhead transmission line according to claim 1, wherein a corner on the outer peripheral surface connecting to the outer end surface is formed in a straight line or a curved line, and a recess is formed between the corner and the adjacent outer peripheral surface.
断面を、実質的に外周面を形成する平滑な外端面と、内
周面となる内端面と、隣り合う成形素線と密着するよう
に電線半径方向に一致した直線状部を有する両側端面と
で形成し、その両側端面の直線状部と上記内端面とを結
ぶ内周面側の角を直線状又は曲線状に形成し、両側端面
の直線状部と上記外端面とを結ぶ外周面側の角を直線状
に形成すると共に、その角の直線部の両端を曲線状に形
成し、隣接する外周面側の角とで窪みを形成する請求項
1記載の架空送電線。3. A cross-section of a forming element wire forming the low-stepped smooth portion is substantially in contact with a smooth outer end surface forming an outer peripheral surface, an inner end surface forming an inner peripheral surface, and an adjacent forming element wire. The inner peripheral surface side connecting the linear portion of the both end surfaces and the inner end surface is formed in a straight line or a curved line. In addition to forming the corner on the outer peripheral surface side connecting the linear portion on both side end surfaces and the outer end surface in a straight line, forming both ends of the linear portion of the corner in a curved shape, and forming the corner on the adjacent outer peripheral surface side. The overhead transmission line according to claim 1, wherein the overhead transmission line forms a depression.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11112313A JP2000306434A (en) | 1999-04-20 | 1999-04-20 | Overhead transmission cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11112313A JP2000306434A (en) | 1999-04-20 | 1999-04-20 | Overhead transmission cable |
Publications (1)
Publication Number | Publication Date |
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JP2000306434A true JP2000306434A (en) | 2000-11-02 |
Family
ID=14583553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP11112313A Pending JP2000306434A (en) | 1999-04-20 | 1999-04-20 | Overhead transmission cable |
Country Status (1)
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JP (1) | JP2000306434A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012256454A (en) * | 2011-06-07 | 2012-12-27 | Kyushu Electric Power Co Inc | Overhead transmission line |
JP2015211024A (en) * | 2014-04-30 | 2015-11-24 | 株式会社ジェイ・パワーシステムズ | Overhead transmission line |
-
1999
- 1999-04-20 JP JP11112313A patent/JP2000306434A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012256454A (en) * | 2011-06-07 | 2012-12-27 | Kyushu Electric Power Co Inc | Overhead transmission line |
JP2015211024A (en) * | 2014-04-30 | 2015-11-24 | 株式会社ジェイ・パワーシステムズ | Overhead transmission line |
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